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RH-21

Troubleshooting

CCS Technical Documentation

Page 36



Nokia Corporation Confidential

Issue 1 05/2003

RX VHF VCO

The RX VHF VCO signal is used to generate receiver Intermediate frequency. RX VHF VCO
has one fixed frequency (271.08 MHz). Operating frequency is locked in Phase-locked
loop.

RX VHF VCO output signal is fed to Safari. The inside of the Safari signal is divided into
the Phase detector and RX parts. Before I/Q modulator frequency is divided by 2.

Fault-finding chart for RX VHF VCO

Measure oscillator frequency over L730 coil. Don´t connect probe to pads!

AMPS, CH383

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Содержание RH-21 Series

Страница 1: ...CCS Technical Documentation RH 21 Series Transceivers Issue 1 05 2003 Confidential Nokia Corporation Troubleshooting ...

Страница 2: ...RH 21 Troubleshooting CCS Technical Documentation Page 2 Nokia Corporation Confidential Issue 1 05 2003 ...

Страница 3: ...ng 12 Audio failures 13 Accessory detection 15 Sleep Clock 16 User Interface 18 Receiver Troubleshooting 20 General Instructions for RX troubleshooting 20 Path of the received signal 20 Fault finding charts for receiver chain 21 Transmitter fault finding 28 General instructions for TX troubleshooting 28 Path of the transmitted signal 28 Fault finding charts for transmitter 28 Power control loop 31...

Страница 4: ...RH 21 Troubleshooting CCS Technical Documentation Page 4 Nokia Corporation Confidential Issue 1 05 2003 ...

Страница 5: ... MCU software automatically enters into the local or test mode when the supply voltage is connected to the phone The power can be switched on by 1 Pressing the power key 2 Connecting the local test mode resistors to the BSI BTEMP lines and connecting the battery voltage to the phone 3 Connecting a charger 4 Using the phone s internal functions real time clock alarm In the local and test mode the b...

Страница 6: ...ics 1 Power up 2 Flash programming 3 Audio Earpiece Microphone 4 Charging 5 Accessory detection 6 Sleep clock 7 User interface Display Lights MIDI Vibra Keyboard Power up faults Power up sequence 1 The UEM acts as a HW master during start up Vbatt limits 2 1V for internal state machine 3V triggering whole startup Regulator sequencing HW core regulators on Vio Vcore VR3 Vflash1 These regulators sup...

Страница 7: ... Code written in stone UPP internal ROM the program checks if there is any reason for the FDL mode Flash Down Load If there is an executable code in FLASH and there is no reason for FDL the MCU starts running the MCU program from FLASH 3 MCU runs the FLASH MCU code the phone initialization user interfaces internal blocks etc Core regulator voltage setting for required DSP speed Initializes the DSP...

Страница 8: ...s 1 5 volts and if software is running Vcore will rise to 1 8 volts Cbus 1 08MHz and Dbus clocks start running Phone does not start up normally or does not stay on Note In the case of power up faults it is not possible to force the phone on by disabling the watchdog Instead measurements should be taken immediately when the power key is pressed or when the bat tery voltage is connected to the phone...

Страница 9: ...CCS Technical Documentation Troubleshooting RH 21 Issue 1 05 2003 Confidential NokiaCorporation Page 9 Figure 2 Fault tree phone does not power up ...

Страница 10: ... After reset is released UPP checks if there is a request for the Bootstrap code that resides in the UPP ROM 6 The request for Bootstrap is the MBUS pulled down by the prommer if the boot strap is not requested the bootstrap code jumps to FLASH SW 7 If the Bootstrap code is requested UPP enters the Flash mode and sets FbusTX to 0 as an acknowledgement to the prommer This is an indication that UPP ...

Страница 11: ...not connected to the Prommer PURX also to Safari VR3 Rfclock VCTCXO Safari UPP Mbus from Prommer UEM UPP MbusRx SA0 FbusTx from UPP UEM Prom mer SA1 BSI and FbusRX from prommer to UEM C103 Boot serial line fail Mbus from Prommer UEM UPP MbusRx SA1 FbusRx from Prommer UEM UPP FbusTx from UPP UEM Prommer C104 MCU ID message sending failed in the Phone FbusTx from UPP UEM Prommer C105 The Phone has n...

Страница 12: ... The Prommer has detected a wrong ID byte in the mes sage which it has received from the Phone FbusTx from UPP UEM Prommer A204 Cx83 Cx84 Cx85 The flash manufacturer and device IDs in the existing Algorithm files do not match with the IDs received from the target phone The Prommer has not received Phone acknowledge to the message The Phone has generated NAK signal during data block transfer Data b...

Страница 13: ...ure the signal from the earpiece line The Audio test box JBA 8 is needed The Audio loop Audio test Ext In Hp Out must be switched on by the Phoenix service software This loop will connect audios only through the UEM In this case the UPP is not used If the internal microphone XEAR fails Feed the tone to the microphone and mea sure the signal from the XEAR line The Audio test box JBA 8 is needed The...

Страница 14: ...dential Issue 1 05 2003 UPP is not used 3 Run the audio loop self test with Phoenix BB Self Tests ST_EAR_DATA_LOOP_TEST This loop will test the ear data mic data lines between the UPP and the UEM Earpiece or external microphone line does not work Figure 4 Fault tree earpiece failure ...

Страница 15: ...icrophone failure Accessory detection 1 Start the phone in the normal mode when checking for accessory detection 2 The Ad converter value of the hookint line can be checked with the Xmic switch on an MJ 8 test jig Changes normally from high to low when no accessory is connected 3 When the headset HDC 5 is connected the hookint value should be between 600 and 800 ...

Страница 16: ...onfidential Issue 1 05 2003 Figure 6 Fault tree accessory detection Sleep Clock Missing nonfunctional sleep clock causes Entering sleep mode fails higher current consumption shorter standby time Baseband self tests cannot be run Phone clock on display does not function properly ...

Страница 17: ...CCS Technical Documentation Troubleshooting RH 21 Issue 1 05 2003 Confidential NokiaCorporation Page 17 Figure 7 Fault tree sleep clock ...

Страница 18: ...RH 21 Troubleshooting CCS Technical Documentation Page 18 Nokia Corporation Confidential Issue 1 05 2003 User Interface Display Keyboard lights do not work Figure 8 Fault tree Display Keyboard lights ...

Страница 19: ...CCS Technical Documentation Troubleshooting RH 21 Issue 1 05 2003 Confidential NokiaCorporation Page 19 Display does not work Figure 9 Fault tree Display does not work ...

Страница 20: ...ard still does not operate normally try to use the Keyboard test in Phoenix to see if the pressed key is identified If it is not identified change the UPP D400 Receiver Troubleshooting General Instructions for RX troubleshooting Start the Phoenix software and use it to start the required RX mode of the mobile phone The troubleshooting flowchart is divided into three steps 1 general checking 2 loca...

Страница 21: ...iaCorporation Page 21 Antenna ext RF Diplexer Duplexer Low Noise Amplifier LNA RX band filter First mixer 135 54 MHz RX IF filter IF amplifier second mixer 14 kHz low pass fil ter adjustable IQ amplifier Baseband Fault finding charts for receiver chain AMPS Figure 10 Fault tree AMPS ...

Страница 22: ...RH 21 Troubleshooting CCS Technical Documentation Page 22 Nokia Corporation Confidential Issue 1 05 2003 ...

Страница 23: ...lectrical contact at 271 08 MHz Note Check all discrete components and voltages around SAFARI Check RF level at RX IF filter input at 135 54 MHz Check RF level at J751 and J752 at 2034 06 MHz N Y Y N Y N Y Start synthesizer troubleshoot N Change RX IF filter Z830 Start synthesizer troubleshoot Check RX I and Q signals at I J801 J803 and Q J804 J802 N Change SAFARI N801 Check UEM and start baseband...

Страница 24: ... dualband Only EXT RF connector 1st IF needs separate troubleshoot at upper band After down conversion RF 135 54 MHz both lower and upper band use the same signal path Figure 11 Fault tree TDMA1900 troubleshooting Apply 1960 02 MHz ch 1000 110 dBm signal to external RF connector X900 Check RXVHF Vc from C720 V 0 7 1 3 N Enable loop back BER using RF Test UI and check sensitivity 110 dBm BER 3 Chec...

Страница 25: ...CCS Technical Documentation Troubleshooting RH 21 Issue 1 05 2003 Confidential NokiaCorporation Page 25 ...

Страница 26: ... The Prommer generates this error also when the Phone is not connected to the Prommer PURX also to Safari VR3 Rfclock VCTCXO Safari UPP Mbus from Prommer UEM UPP MbusRx SA0 FbusTx from UPP UEM Prom mer SA1 BSI and FbusRX from prommer to UEM C103 Boot serial line fail Mbus from Prommer UEM UPP MbusRx SA1 FbusRx from Prommer UEM UPP FbusTx from UPP UEM Prommer C104 MCU ID message sending failed in t...

Страница 27: ...sage which it has received from the Phone FbusTx from UPP UEM Prommer Cx82 The Prommer has detected a wrong ID byte in the mes sage which it has received from the Phone FbusTx from UPP UEM Prommer A204 Cx83 Cx84 Cx85 The flash manufacturer and device IDs in the existing Algorithm files do not match with the IDs received from the target phone The Prommer has not received Phone acknowledge to the me...

Страница 28: ...ith Phoenix autotune SW Path of the transmitted signal AMPS DAMPS UEM TX I Q DA converters I Q modulator and Digital gain step amplifier SafariSafari IF BPF Upconverter driver BPF PA Coupler Power detector Duplex filter Diplexer EXT RF connector Antenna TDMA1900 ONLY DUALBANDER UEM TX I Q DA converters I Q modulator and Digital gain step amplifier Safari IF BPF Upconverter driver Safari Balun BPF ...

Страница 29: ...CCS Technical Documentation Troubleshooting RH 21 Issue 1 05 2003 Confidential NokiaCorporation Page 29 ...

Страница 30: ...echnical Documentation Page 30 Nokia Corporation Confidential Issue 1 05 2003 TDMA800 The transmitter chain is exactly the same as AMPS mode with the exception of the IPA current Therefore it is important that AMPS has no faults ...

Страница 31: ... TDMA1900 mode and DAMPS mode have a common RF modulator making it important that the DAMPS mode has no faults Power control loop Basically power detection is done with the Power detector module and power control is done inside Safari Power detection is basically similar for both bands except both bands have individual couplers ...

Страница 32: ...YPICAL DETECTED VOLTAGES AT POWER LEVELS PL2 PL10 FOR DUALBANDER 800A 800D 1900D Pout TXPWRDET Pout TXPWRDET Pout TXPWRDET PL dBm dac mV dBm dac mV dBm dac mV 2 26 5 633 1671 27 3 696 1839 27 3 662 1746 3 22 5 393 1038 23 3 433 1142 23 3 405 1069 4 18 5 237 625 19 3 261 688 19 3 245 648 5 14 5 141 372 15 3 155 410 15 3 147 387 6 10 5 82 215 11 3 90 237 11 3 84 222 7 6 5 46 120 7 3 50 132 7 3 46 12...

Страница 33: ...900D TYPICALDETECTEDVOLTAGESATPOW ERLEVELSPL2 PL10FORSINGLEBANDER 800A 800D Pout TXPWRDET Pout TXPWRDET PL dBm dac mV dBm dac mV 2 25 5 559 1475 27 3 671 1771 3 21 5 388 1023 23 3 465 1228 4 17 5 234 618 19 3 281 742 5 13 5 140 371 15 3 168 445 6 9 5 81 215 11 3 98 258 7 5 5 45 120 7 3 54 144 8 3 3 31 82 9 0 7 15 40 10 4 7 5 14 NOTE DACVALUESMAYVARYABOUT 20 NOTE TXPWRDETisdifferencebetweenTXonburs...

Страница 34: ...band is from 2009 1 to 2059 02 MHz In upper band the output fre quency range from the UHF VCO is from 2031 81 MHz to 2125 53 MHz A practical way to check out the synthesizer status is to measure control voltage of the VCO from the Integrator capacitor If voltage is stable and reasonable local oscillators are running correctly 19 44 MHz reference oscillator The 19 44 MHz oscillator frequency G790 i...

Страница 35: ...ting RH 21 Issue 1 05 2003 Confidential NokiaCorporation Page 35 Fault finding chart for 19 44 MHz oscillator START HERE Is VCTCXO oscillating 19 44MHz 1 Check voltage C792 2 78 V Check resistor R792 1 No OK No OK 2 Change VCTCXO 2 No OK OK ...

Страница 36: ...ncy RX VHF VCO has one fixed frequency 271 08 MHz Operating frequency is locked in Phase locked loop RX VHF VCO output signal is fed to Safari The inside of the Safari signal is divided into the Phase detector and RX parts Before I Q modulator frequency is divided by 2 Fault finding chart for RX VHF VCO Measure oscillator frequency over L730 coil Don t connect probe to pads AMPS CH383 ...

Страница 37: ...ri T IC contains stages like counters prescaler divider by two phase and frequency comparator and a charge pump circuit which allows two opera tional modes analog and digital The UHF VCO Oscillation frequency is from 2009 1MHz to 2125 53 MHz In the upper band TDMA1900 2 GHz synthesizer frequency is fed straight to mixers In the lower band AMPS and TDMA800 2 GHZ UHF VCO frequency signal is first di...

Страница 38: ...g CCS Technical Documentation Page 38 Nokia Corporation Confidential Issue 1 05 2003 of the VCO depends on the DC control voltage which is controlled by the PLL circuit inside Safari Fault finding chart for UHF Synthesizer ...

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